Sgt Bowe Bergdahl has told people treating him at a US military medical facility in Germany that he was tortured, beaten and held in a cage by his Taliban captors in Afghanistan after he tried to escape, a senior US official says.

The official spoke on condition of anonymity because he was not authorised to discuss what Bergdahl has revealed about the conditions of his captivity.

The official said it was difficult to verify the accounts Bergdahl has given since his release a week ago.

Bergdahl, now 28, was captured in June 2009 after he disappeared from his infantry unit.

He was held for nearly five years by Taliban militants.

The New York Times reported Sunday that military doctors at the Landstuhl Regional Medical Center say that while Bergdahl is physically able to travel he’s not yet emotionally prepared to be reunited with his family. He has not yet spoken to his family.

Bergdahl was returned to the US military in exchange for the release of five Taliban militants from the US military prison at Guantanamo Bay, Cuba.

The deal, which the Obama White House brokered without consulting Congress, ignited a political firestorm that shows no signs of abating.

Lawmakers, both Republicans and Democrats, who initially praised Bergdahl’s release, quickly backed off amid questions about whether he was a deserter who walked away from his post and an outcry over the exchange.0

Some of Bergdahl’s fellow soldiers maintain that Americans died during efforts to find and save him.

On Wednesday, Bergdahl’s hometown of Hailey, Idaho, abruptly cancelled plans for a welcome-home celebration, citing security concerns, and on Saturday the FBI said Bergdahl’s family had received threats that are being investigated by federal, state and local authorities.